Deformation Coordination Analysis Of RCC Gravity Dam With Partitioned Structures Based On FEM

At present,more than 550 RCC dams have been built around the world.Although the construction technic has become mature,many problems still exist in the operation of RCC dams,among which the seepage problem of RCC dams is most serious.In order to solve the serious leakage problem of RCC gravity dam,a new type of high flow antiimpervious and anti-cracking concrete material is designed to combine economic,durability and rapid construction characteristics.The transition layer between the new impervious material and the main roller compacted concrete is provided to prevent seepage and improve the contact deformation between different partitions.Study on the influence of transition layer structure and material modulus of transition layer on stress,deformation and contact deformation of RCC dams.In view of the above problems,the main contents and achievements of this paper are as follows:(1)The functionally-graded structure of RCC gravity dam facing new upstream impervious structure is proposed.The concrete materials with different functions are applied in different areas,so that it has the characteristic of functionally gradient: the upstream adopts a new type of impervious structure,the main body adopts three-grade RCC,and the transition layer is arranged to assist the seepage prevention and improve the contact deformation.Design the structure form of the transition layer and select the elastic modulus of the transition layer material.(2)Based on actual projects,the finite element software ANSYS is used to calculate and compare the stress and deformation of RCC gravity dam under different transition layer structure and material.Through the contact setting of the area contact surface,the deformation calculation and contrast analysis of the contact surface are carried out.Through the comparison of the results,the optimal combination of transitional layer structure and transitional layer material elastic modulus is obtained.(3)The finite element analysis of stress and displacement of the dam section,the contact penetration,contact sliding distance and contact pressure between the HIAC and RCC transition layers provides the basis for the choice of the elastic modulus of the transition layer structure and the transition layer material.The calculation scheme accords with the requirement of deformation and coordination,it can select a small elastic modulus transition layer material according to the actual project,so as to make its ultimate tensile rate as large as possible,and strengthen its Anti-cracking property.Considering the tensile strength and contact pressure of the dam section,the rectangular transition layer structure can be selected.